低熔点合金填充聚合物材料断口形貌研究

研究了合金元素、加工温度、金属含量、第三组分对低熔点金属填充聚合物材料断口形貌的影响。实验结果表明:不同的合金对体系的影响很大,低分子量、低结晶性聚合物,高的成型加工温度可提高材料的相容性。     

碳钢贮热水箱的模拟腐蚀试验及涂层耐蚀性能研究

碳钢贮热水箱长期在30～80°C温变的热水环境中工作,易受到热水及水中杂质的腐蚀。研究了不同温度下Q235钢在自来水及含100μg/mLNaCl的自来水中的腐蚀速率。对裸钢及其涂覆相同厚度的不同涂层──酚醛环氧(自制)、钛纳米聚合物和改性聚乙烯后在70°C自来水中的极化曲线进行了比较。采用动电位扫描极化曲线测量和电化学交流阻抗谱法(EIS)分别对涂覆不同涂层的Q235钢进行了耐蚀性能研究。结果表明,3种防腐涂层均具有较佳的抗热水性,耐蚀能力较强,适宜对Q235钢贮热水箱进行防护。     

Processing study of a high temperature adhesive

An adhesive-bonding process cycle study was performed for a polyimidesulphone. The high molecular weight, linear aromatic system possesses properties which make it attractive as a processable, low-cost material for elevated temperature applications. The results of a study to better understand the parameters that affect the adhesive properties of the polymer for titanium alloy adherends are presented. These include the tape preparation, the use of a primer and press and simulated autoclave processing conditions. The polymer was characterized using Fourier transform infrared spectroscopy, glass transition temperature determination, flow measurements, and weight loss measurements. The lap shear strength of the adhesive was used to evaluate the effects of the bonding process variations.     

马来酸酐接枝聚丙烯的进展

马来酸酐接枝聚丙烯是拓宽聚丙烯应用领域的重要手段之一,本文综述了马来酸酐接枝聚丙烯的接枝方法和原理,接枝物的性能以及接枝物在聚丙烯合金和共混物、复合材料、粘合剂和涂料领域的广泛应用。     

基于形状记忆合金的TMD半主动控制

针对建筑结构在随机荷载或风荷载作用下可能发生的频率不确定问题,特别是结构自振频率会随振幅的大小而发生漂移的非线性振动问题,提出性能可靠、构造简单的形状记忆合金SMA-TMD自适应半主动控制系统.从理论上探讨形状记忆合金在变刚度TMD控制装置中的应用,并进行相应的参数设计.同时,在研究随机荷载作用下TMD系统动力特性的基础上,结合短时傅里叶变换(STFT)设计出该系统的自适应半主动控制算法.算例表明,SMA-TMD自适应控制系统能较好地识别结构系统的时频特性,并进行有效的控制,具有性能可靠和自适应能力强等特点.该自适应控制系统较传统的TMD被动控制减震效果更好,鲁棒性更强.     

钛纳米改性聚合物防腐涂料的研究

为保护大庆油田三元复合液中油管,以钛纳米改性聚合物为主要原料,研制了钛纳米改性聚合物重防腐涂料.采用透射电子显微镜(TEM)研究了钛纳米改性聚合物平均粒径.采用正交试验法,确定最佳原料配比.采用扫描电子显微镜(SEM)研究了漆膜腐蚀.采用金相显微镜研究了钛纳米改性聚合物在漆膜中的分布.探讨了油管的腐蚀机理和钛纳米涂料的防护机理.实验结果表明:钛纳米含量为6%时,涂料具有最佳的防腐蚀效果,能很好的保护大庆油田三元复合液中的油管,并具有优异的抗化学药品介质的腐蚀性能.     

Corner forming of AZ61A magnesium alloy tube within warm hydroforming

The corners with small radii on cross sections are crucial for forming hydroformed components with polygonal sections.In this paper,warm hydroforming experiments of AZ61A magnesium alloy tubes were carried out to study the forming regularity of round corners by using a demonstration part with square sections.Effects of temperature on radius forming,thinning ratio distribution and microstructure were revealed and a component with relative outer corner radius of 3.0 was obtained by warm hydroforming at 240℃.The minimum thickness of the formed square section was located in the transition position between the corner and the straight wall.The thinning ratio of the round corner increased with the increase of forming temperature.Formability of the magnesium tube was improved by raising temperature under the effect of dynamic recrystallization at 240℃.     

Computation of concentrations of characteristic atoms of alloys in BCC structure

In this paper,taking Nb-Mo alloy system as an example,the equations of concentration of characteristic atoms of alloys in BCC structure were obtained on the basis of the idea of systematic science of alloys and the number of coordination atoms.The concentrations of characteristic atoms in B2-NbMo type ordered alloys were calculated as functions of ordering degree(s) and composition xMo.When s=smax,the concentrations of characteristic atoms of stoichiometric B2-NbMo intermetallic compound are equal to that o...     

铝合金中锌、铁的快速测定--原子吸收分光光度法

样品以盐酸溶解，加入过氧化氢助溶，蒸至近干．加入1 1盐酸提取，移入100mL容量瓶中，分取部分溶液于50mL容量瓶中，调整盐酸酸度为5％，用水稀至刻度，摇匀后，以空气-乙炔火焰水相直接测定锌和铁。为了消除大量基体元素的影响，在标准系列中加入相当量的铝。此方法快捷、简便，亦可用于锰、镁、铜、铅、镍的测定。     

钯－银合金膜分离氢气的研究

采用厚为５０μｍ的Ｐｄ／Ａｇ（２３）合金膜进行了氢气渗透系数的测定和Ｈ＿２／Ｎ＿２混和气分离的研究，得出温度、压力、膜厚、进料气流量、膜的预处理和再活化及膜表面中毒等因素对氢气渗透的影响。分离Ｈ＿２／Ｎ＿２混和气可获得高纯氢气。